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Torque for installing Bombshell crank
Dear All,
I want to install a Bombshell Spinnergy Mini crank (2 piece crank with 24mm axle) but in order to do this I need to know how tight the left crankarm fixing bolt should be. The manufacturer has ignored all my messages for this information and I would like to ask if anyone in the group has the experience with these cranks. If not what it the best way to figure out the proper torque? As a side note, I bought these cranks directly from the manufacturer because he told me that they are Hollowtech II compatible with a chainline of 42 mm (it replaces a Shimano DXR FC-MX70 crankset). Unfortunately this was not true. Installation required spacers to distance the crank from the bottom bracket (otherwise it would not turn) and the chainline was closer to 48 mm.. I had to place the chainring behind the crank to bring it inwards by 4 mm and allow the belt to turn without skipping. It works now but of course it is ugly and dishonesty is hard to swallow. Thanks in advance Dimitris |
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#2
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Torque for installing Bombshell crank
On 12/1/2018 2:08 PM, dstamat wrote:
Dear All, I want to install a Bombshell Spinnergy Mini crank (2 piece crank with 24mm axle) but in order to do this I need to know how tight the left crankarm fixing bolt should be. The manufacturer has ignored all my messages for this information and I would like to ask if anyone in the group has the experience with these cranks. If not what it the best way to figure out the proper torque? As a side note, I bought these cranks directly from the manufacturer because he told me that they are Hollowtech II compatible with a chainline of 42 mm (it replaces a Shimano DXR FC-MX70 crankset). Unfortunately this was not true. Installation required spacers to distance the crank from the bottom bracket (otherwise it would not turn) and the chainline was closer to 48 mm. I had to place the chainring behind the crank to bring it inwards by 4 mm and allow the belt to turn without skipping. It works now but of course it is ugly and dishonesty is hard to swallow. Thanks in advance Dimitris You might ask their vendor: https://www.danscomp.com/products/45...et_Cranks.html -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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Torque for installing Bombshell crank
On Saturday, December 1, 2018 at 12:08:39 PM UTC-8, dstamat wrote:
Dear All, I want to install a Bombshell Spinnergy Mini crank (2 piece crank with 24mm axle) but in order to do this I need to know how tight the left crankarm fixing bolt should be. The manufacturer has ignored all my messages for this information and I would like to ask if anyone in the group has the experience with these cranks. If not what it the best way to figure out the proper torque? As a side note, I bought these cranks directly from the manufacturer because he told me that they are Hollowtech II compatible with a chainline of 42 mm (it replaces a Shimano DXR FC-MX70 crankset). Unfortunately this was not true. Installation required spacers to distance the crank from the bottom bracket (otherwise it would not turn) and the chainline was closer to 48 mm. I had to place the chainring behind the crank to bring it inwards by 4 mm and allow the belt to turn without skipping. It works now but of course it is ugly and dishonesty is hard to swallow. Thanks in advance Dimitris Pay VERY close attention to the bottom line of that reference Andrew gave you - maximum weight limit 135 lbs |
#4
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Torque for installing Bombshell crank
On Saturday, December 1, 2018 at 11:40:45 PM UTC+1, wrote:
On Saturday, December 1, 2018 at 12:08:39 PM UTC-8, dstamat wrote: Dear All, I want to install a Bombshell Spinnergy Mini crank (2 piece crank with 24mm axle) but in order to do this I need to know how tight the left crankarm fixing bolt should be. The manufacturer has ignored all my messages for this information and I would like to ask if anyone in the group has the experience with these cranks. If not what it the best way to figure out the proper torque? As a side note, I bought these cranks directly from the manufacturer because he told me that they are Hollowtech II compatible with a chainline of 42 mm (it replaces a Shimano DXR FC-MX70 crankset). Unfortunately this was not true. Installation required spacers to distance the crank from the bottom bracket (otherwise it would not turn) and the chainline was closer to 48 mm. I had to place the chainring behind the crank to bring it inwards by 4 mm and allow the belt to turn without skipping. It works now but of course it is ugly and dishonesty is hard to swallow. Thanks in advance Dimitris Pay VERY close attention to the bottom line of that reference Andrew gave you - maximum weight limit 135 lbs Thank you for your concern but the Spinnergy is not the same crank as the one in Andrew's link. Neither the manufacturer nor the vendors respond to my requests (strange isn't it?) and I have not heard anything either from the people in this group.. Let's say that I do not know what is the appropriate torque for the installation of a 2 piece crank. How do I proceed with the installation? How do I know when it is too loose or too tight? Any help will be appreciated Thanks in advance |
#5
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Torque for installing Bombshell crank
On 9/12/18 8:43 pm, dstamat wrote:
On Saturday, December 1, 2018 at 11:40:45 PM UTC+1, wrote: On Saturday, December 1, 2018 at 12:08:39 PM UTC-8, dstamat wrote: Dear All, I want to install a Bombshell Spinnergy Mini crank (2 piece crank with 24mm axle) but in order to do this I need to know how tight the left crankarm fixing bolt should be. The manufacturer has ignored all my messages for this information and I would like to ask if anyone in the group has the experience with these cranks. If not what it the best way to figure out the proper torque? As a side note, I bought these cranks directly from the manufacturer because he told me that they are Hollowtech II compatible with a chainline of 42 mm (it replaces a Shimano DXR FC-MX70 crankset). Unfortunately this was not true. Installation required spacers to distance the crank from the bottom bracket (otherwise it would not turn) and the chainline was closer to 48 mm. I had to place the chainring behind the crank to bring it inwards by 4 mm and allow the belt to turn without skipping. It works now but of course it is ugly and dishonesty is hard to swallow. Thanks in advance Dimitris Pay VERY close attention to the bottom line of that reference Andrew gave you - maximum weight limit 135 lbs Thank you for your concern but the Spinnergy is not the same crank as the one in Andrew's link. Neither the manufacturer nor the vendors respond to my requests (strange isn't it?) and I have not heard anything either from the people in this group. Let's say that I do not know what is the appropriate torque for the installation of a 2 piece crank. How do I proceed with the installation? How do I know when it is too loose or too tight? Any help will be appreciated Thanks in advance Does the bolt screw in to the crank material (aluminium) directly? What diameter is the bolt, and the thread pitch? You can probably find an appropriate maximum torque value from somewhere on the internet, based on the thread material, bolt diameter and thread pitch, I would think. -- JS |
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